Year to year /6 compatibility

Thanks for all the info guys. I'll keep an eye out for a post 1968 motor, otherwise it sounds like everything will bolt up. I have my fair share of projects, so I'm mostly just looking to keep this truck as reliable as possible. I'll probably transfer my 1920 Holley over for the time being and look into a 2 barrel in the future. The extra power is always a bonus, I'll see if I can find the sweet spot with a 1969-early 70s motor and try to avoid the low compression/emissions hassle.